The Astronomical New Moon is on Monday 28 October 2019 at 3.38 am. The crescent may be visible in parts of America on this day.
The calculations for crescent visibility on Tuesday 29 October 2019 for London are as follows
Crescent age 37 hours 3 minutes
Moon lag time 1 hour 7 minutes
Crescent altitude 8.28 degrees
Crescent elongation 21.11 degrees
The crescent will be easily visible with the naked eye.
1st Rabi ul Awwal 1441AH will be on Wednesday 30 October 2019 in Europe.